Looking at this "why is it? "question I see it has 1 close vote and a bounty. I think its too vague to be a good question so I thought I'd give it a close vote - but when I attempted to do so, it was ...

The author of this recent question, after receiving a valid answer, completely rewrote his question, invalidating the answer. The author also opened a bounty.
What should be done with such questions?
...